CN103048799A - Method, apparatus and control device for reducing speckle effects on display elements of display apparatus - Google Patents
Method, apparatus and control device for reducing speckle effects on display elements of display apparatus Download PDFInfo
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- CN103048799A CN103048799A CN2012103856838A CN201210385683A CN103048799A CN 103048799 A CN103048799 A CN 103048799A CN 2012103856838 A CN2012103856838 A CN 2012103856838A CN 201210385683 A CN201210385683 A CN 201210385683A CN 103048799 A CN103048799 A CN 103048799A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/48—Laser speckle optics
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/014—Head-up displays characterised by optical features comprising information/image processing systems
Abstract
The invention refers to a method, apparatus and control device for reducing speckle effect on display elements of a display apparatus. The display apparatus includes an optical instrument for projecting images on a projection screen (220) and a deflecting mirror for deflecting the images to display elements from the projection screen (220). The method includes moving the projection screen (220) and/or the deflecting mirror in at least one direction so as to reduce speckle effects.
Description
Technical field
The present invention relates to for reducing method, the device that be used for reduce mottled effect image display element in display device on, corresponding opertaing device and the corresponding computer program of image in the mottled effect on the display element of display device.
Background technology
Facing demonstration and need to can be used as the flat surface that projecting plane, so-called screen are used based on laser projection system.The size that arranges for this screen is usually greater than 3x6cm, is important at size, pixel quantity and the optical relation between the distance between projector and the screen of screen here wherein.When optical design, this point is determined, thereby also necessarily can be used the screen that has less than the size of mentioning.
That this flat surface comprises usually is intrinsic, also be the sightless unevenness of bore hole, this unevenness produces so-called mottled effect.This effect causes zonule that do not expect, visible, that have the light intensity deviation that is determined by accidentalia at the image of institute's projection, and described zonule is called as Image Speckle (English speckle=spot, spot).
The solution that is used for the spot minimizing is generally followed technical scheme, intervenes between optical instrument (Apparat) (for example laser projection system) and projecting plane in described technical scheme.
US 20100232005A1 discloses a kind of laser beam display of the computing equipment be used to having the space phase modulator, described space phase modulator is connected between light source and the sampling module, in order to reduce by the spot in the demonstration image of phase-modulation realization on projecting to the projecting plane of light beam.
Summary of the invention
As background, utilize the present invention introduced according to main claim be used for to reduce image in the method for the mottled effect on the display element of display device, be used for reducing the device of the mottled effect on the display element of image in display device, introduced in addition and used the opertaing device of the method and introduced at last corresponding computer program.Obtain in the description of favourable expansion scheme by corresponding dependent claims and back.
Mottled effect can be reduced, and its mode is to make the optical element motion of display device.The screen of display device is moved continuously.In order to produce motion, can use suitable actuator, it is for example based on electroactive material.Thereby for example can be by the motion that makes to be arranged on the material place of electroactive material, this material for example is used as the screen in the envisaging display system.
According to the scheme of suggestion here, electroactive material for example can be piezo actuator, electroactive polymer or any other suitable material type.For example can consider the flexible piezoelectric face actuator of waveform bending as piezo actuator, electroactive polymer can be dielectric or ion EAP(electroactive polymer).
The scheme of advising here provides following advantage: only can intervene display device in projecting plane, for example projection screen or deflecting mirror.Can abandon between each optical element of display device independent equipment in the middle of connect.Therefore can save structure space and cost.
The invention provides a kind of method for reducing the mottled effect of image on the display element of display device, described display device comprises that wherein the method has following step be used to the deflecting mirror that projects image onto the optical instrument on the projection screen and be used for image is deflected into from projection screen display element:
Motion projection screen and/or deflecting mirror at least one direction are in order to reduce mottled effect.
The method for example can be used for making the virtual image that produced by laser for human eye as far as possible interference-free as seen, its mode is to get rid of mottled effect or at least significantly reduce mottled effect.So-called mottled effect (Speckle=spot, spot) is the optical fringe pattern that forms during by the surface reflection of injustice when enough relevant light.Even the surface unevenness or granularity is very meticulous, when being ND for human eye namely also, this effect also demonstrates.When the image of observing by this surface reflection, so the observer for example sees the image of being realized by a large amount of white spots.
Display device can be looked squarely device with envisaging display system or HUD(HUD=Head-Up Device()) form exist.This device for example can use in vehicle, in order to supply relevant optical information to the vehicle driver on height of sighting line.Correspondingly, display element can be the windshield of vehicle or be arranged in transparent material on the windshield, for example the German combiner of combiner, information.Have in the situation of combiner as the HUD of optical element in use, image is not directly to be projected on the windshield, but is projected on the combiner.Can be on display element display case as with the virtual image form for information about, this image for example can comprise text or graphic element.
Optical instrument can be the laser-projector for generation of monochrome or colorama.The information that this optical instrument can be configured to will to be presented at by directional beam the virtual image on the display element projects on the projection screen, in order to show the former figure of virtual image thereon.
Correspondingly, projection screen can be element flat, for example rectangle, and its surface is fit to reflect in this wise the beam from the optical instrument emission, thereby forms the former figure of virtual image.For this reason, projection screen is positioned in the suitable distance with respect to the beam outgoing opening of optical instrument.The reflecting surface of projection screen can have the structure for the sightless particulate of eyes, and mottled effect can be based on this structure.Projection screen can have several square centimeters size, for example approximate 3x6 centimetre area.
Deflecting mirror can be configured again, be presented at the reflection of the former figure on the projection screen and it may be deflected on the display element enlargedly in order to set up, so by this display element at last this virtual image for observer's eyes, look like visible.From observer's angle, this virtual image can seem this virtual image be arranged in the display element back, under vehicle condition for example in the zone of hood of vehicle or in the front area of vehicle.In addition, deflecting mirror can be positioned with the proper angle of relative projection screen.Deflecting mirror for example can be refrative mirror, and this refrative mirror is particularly suitable for using in conjunction with laser equipment based on its more sane coating.
Display device can be comprised of optical instrument, projection screen and deflecting mirror.In addition, display element can be the part of display device or the independent element that can be used as display device.At this, optical instrument, projection screen and deflecting mirror can be disposed in the common housing, and wherein this housing is adjacent to arrange with display element again.Can arrange at least one other optical element, for example lens or another mirror in the light path between optical instrument, projection screen, deflecting mirror and display element.
Can motion projection screen and deflecting mirror, perhaps can the motion deflecting mirror, and projection screen keeps immobilizing, and perhaps instead, the projection screen motion, and deflecting mirror keeps immobilizing.This motion can realize by projection screen or deflecting mirror in the movement on horizontal or vertical direction.Additionally or instead, this motion also can represent rotatablely moving of projection screen or deflecting mirror.This motion can in one direction and then be carried out at the other direction opposite with it at once.At this, this motion can represent projection screen or the deflecting mirror minimum position in micron or nanometer range and change and periodically repeat, for example on the predetermined time period, but or on the duration that display device is switched on.Mottled effect can be reduced or eliminate, and its mode is to produce accurate mixed and disorderly beam reflection by motion projection screen or deflecting mirror.This motion may be implemented as so that projection screen or deflecting mirror or be in continuously in the motion, perhaps the static intermittence between each motion so of short duration so that it is ND for human eye.If make not only projection screen but also deflecting mirror motion, then the motion of two elements can often coordinated with each otherly be that one of two elements are carried out motion.If one of element then also can be eliminated mottled effect by this mode because the upset of direction of motion is in staticly just.At this, the coordination of motion can be controlled by being used for controlling the opertaing device that produces the actuator that moves.
For example can projection screen is mobile and/or mobile orthogonally with this original plane in this original plane about the original plane of projection screen in movement step.Instead or additionally, can be with projection screen around the axis rotation that is in the original plane.Additionally or instead, can deflecting mirror is mobile and/or around the axis rotation that is in the original plane orthogonally about the original plane of deflecting mirror and original plane.This original plane can define projection screen or deflecting mirror and be in residing plane when static.Therefore original plane can represent rest position or initial position.If one of element can be carried out at least two different motions, for example linear movement and rotatablely moving or two linear movements along the different motion axis, then element since the stationary state of the stop of one of motion can be avoided.For this reason, be used for making the actuator of respective element motion can be controlled as so that the in time mutually appearance of the stop of at least two different motion with staggering.
According to an embodiment, the method can also have the step of pumping signal being exported at least one electroactive actuator.This electroactive actuator can be configured to carry out movement step in response to pumping signal.This pumping signal for example can be produced and output by the opertaing device that is connected with electroactive actuator.This pumping signal can be by given in advance or for example be output based on sensor signal.For this reason, the method for suggestion can have step here: detect on projection screen and/or deflecting mirror image and with the image-based image signal output to opertaing device.Based on this picture signal, opertaing device can then be exported to electroactive actuator with suitable pumping signal.This electroactive actuator can be the parts of display device, and these parts are converted to mechanical motion with the Electron Excitation signal, in order to therefore make the motion of projection screen and/or deflecting mirror.For this reason, actuator can directly be arranged contiguously with the surface of projection screen and/or deflecting mirror.Electroactive actuator for example can be arranged such that its for example fringe region of contact projection screen and/or deflecting mirror.This embodiment provides following advantage: can carry out the accurate controlled motion of projection screen or deflecting mirror.The beginning of this motion and end and movement rate therefore can be adjusted according to current demand exactly.
The present invention provides a kind of device for reducing the mottled effect of image on the display element of display device in addition, this display device comprises that wherein this device has following feature be used to projecting image onto the optical instrument on the projection screen and being used for the deflecting mirror of image from projection screen to display element deflection:
Be used for making projection screen and/or deflecting mirror to move in order to reduce the equipment of mottled effect at least one direction.
This equipment can comprise electroactive actuator or be made of it.
This device can be configured to the step of the inventive method be carried out in corresponding equipment or implemented.Also can by this enforcement flexible program with device form of the present invention solve fast and efficiently the present invention based on task.
Current, device can be understood as electric equipment, this electricity device processes sensor signal and according to its output control signal and/or data-signal.This device can have interface, and this interface can be constructed with hardware and/or software mode.In the structure of hardware mode, interface for example can be the part of so-called system ASIC, and the ASIC of this system comprises the most different function of device.But also possible is that these interfaces are distinctive integrated circuit or are comprised of discrete parts at least in part.In the structure of software mode, interface can be software module, and these software modules for example are present on the microcontroller except other software module.
According to an embodiment, the equipment that is used for motion projection screen and/or deflecting mirror can have at least one first electroactive actuator.This electroactive actuator can be configured to carry out vibration in response to the first pumping signal, so that the motion projection screen.Additionally or instead, this equipment can have at least one second electroactive actuator.This electroactive actuator can be configured to carry out vibration in response to the second pumping signal, so that the motion deflecting mirror.At this, the first actuator so can be positioned in the display device, so that it for example abuts on the side or lower master of projection screen.The second actuator can be arranged about deflecting mirror with identical or similar fashion.Can make the motion of projection screen or deflecting mirror, its mode is, with the vibration transmission of the first actuator to projection screen or with the vibration transmission of the second actuator to deflecting mirror.Obviously, also can use a plurality of first and second electroactive actuators, they for example can be arranged evenly distributedly around projection screen and/or deflecting mirror.The use of electroactive actuator provides following advantage: simple and device that the cost lowland will be made can be used to make projection screen or deflecting mirror motion.
The first electroactive actuator and/or the second electroactive actuator for example can comprise piezoelectric element.Piezoelectric element can be following device, and this device takes full advantage of piezoelectric effect, in order to carry out the mechanical motion with vibration mode of actuator here by electric excitation signal being imposed on piezoelectric element.The energy of vibration can be transferred on projection screen or the deflecting mirror again, in order to they are moved as has been elaborated like that.Piezoelectric effect is physical phenomenon: definite material is out of shape when applying voltage and vice versa.The first or second piezoelectric element for example can be placed in the vibration by pumping signal.The first and/or second electroactive actuator for example can be made of piezoelectric element and metal platelet, and piezoelectric element for example is fixed on the described metal platelet by bonding.Here, it is favourable using the actuator with piezoelectric element, because these actuator response are carried out very little maximum deflection and therefore are particularly suitable for projection screen or the desirable motion of deflecting mirror in micrometer range and nanometer range in electric signal.
According to an embodiment, the equipment that is used for motion projection screen or deflecting mirror can also have the first carrier element.At this, this first electroactive actuator can be disposed between projection screen and the first carrier element, in order to projection screen is connected with the first carrier element.This equipment can have the Second support element in addition, and wherein the second electroactive actuator can be disposed between deflecting mirror and the Second support element, in order to deflecting mirror is connected with the Second support element.This embodiment provides following advantage, can make up back-pressure by using first or the Second support element that for example are fixed with the first and/or second actuator at its place, and this back-pressure is suitable for realizing the motion of projection screen or deflecting mirror.
According to another embodiment, this device can have for detection of the image on projection screen and/or deflecting mirror and the output sensor based on the picture signal of this image.This device can comprise in addition for the opertaing device of controlling the equipment that is used for motion projection screen and/or deflecting mirror based on picture signal.The contrast value that this sensor for example can be configured to the image that will detect sends opertaing device to.There, can determine based on contrast value the suitable vibration of electroactive actuator.Therefore can be advantageously for example exactly according to duration of current demand adjustment vibration and/or frequency and therefore more effectively suppress mottled effect.
The present invention also provides a kind of opertaing device for reducing the mottled effect of image on the display element of display device, this display device comprises that wherein this opertaing device has following feature be used to projecting image onto the optical instrument on the projection screen and being used for the deflecting mirror of image from projection screen to display element deflection:
Be used for receiving the input interface of picture signal, wherein picture signal is provided by the sensor for detection of the image on projection screen and/or deflecting mirror;
Be used for to determine based on the pumping signal of picture signal locking equipment really; With
Be used for the output interface at least one electroactive actuator output drive signal, this electroactive actuator is configured to make projection screen and/or deflecting mirror motion in response to pumping signal.
Opertaing device can be configured to carry out or implement the step of the inventive method in corresponding equipment.Also by the enforcement deformation program of the present invention with the opertaing device form, can be fast and solve efficiently the present invention based on task.
Opertaing device is current to can be understood as electric equipment, this electricity device processes sensor signal and according to its output control signal.This opertaing device can have interface, and this interface can be constructed with hardware and/or software mode.In the structure of hardware mode, interface for example can be the part of so-called system ASIC, and the ASIC of this system comprises the most different function of opertaing device.But also possible is that these interfaces are distinctive integrated circuit or are comprised of discrete parts at least in part.In the structure of software mode, interface can be software module, and these software modules for example can be present on the microcontroller except other software module.
The computer program that also advantageously has program code, described program code can be stored in machine-readable carrier, as on semiconductor memory, harddisk memory or the optical memory, and when program at computing machine or device when carrying out, be used to implement the method according to one of aforementioned embodiments.
Description of drawings
The below exemplarily sets forth the present invention in more detail by appended accompanying drawing.Wherein:
Fig. 1 illustrates for the schematic diagram of setting forth mottled effect;
Fig. 2 illustrates the schematic diagram that has according to the vehicle of the display device of the embodiment of the invention;
Fig. 3 A to 3D illustrates according to the schematic diagram embodiment of the invention, that be used for reducing by the projection screen of motion display device the equipment of mottled effect;
Fig. 4 illustrates the schematic diagram according to the electroactive actuator of the embodiment of the invention;
Fig. 5 illustrates the schematic diagram for the minimizing of setting forth mottled effect;
Fig. 6 A to 6C illustrates according to the schematic diagram embodiment of the invention, that be used for reducing by the deflecting mirror of motion display device the equipment of mottled effect;
Fig. 7 illustrates the schematic diagram according to the display device of the embodiment of the invention; With
Fig. 8 illustrates according to the process flow diagram embodiment of the invention, that be used for the method for the mottled effect of minimizing image on the display element of display device.
Embodiment
In the description of the back of the preferred embodiments of the present invention, for shown in the different figure and the element that works similarly use identical and similar Reference numeral, wherein abandon the description to the repetition of these elements.
Fig. 1 correspondingly shows for the schematic diagram of setting forth mottled effect.Shown is the segment in the cross section on projecting plane 100, and the surface on this projecting plane has granular or coarse structure.Different from the diagram in Fig. 1, this surperficial granularity be in micro-among a small circle in and illustrate enlargedly in order to understand better here.
Because described intrinsic unevenness, the surface of projection surface 100 has the scattering center 110 of a large amount of point-like.If now as the material of projecting plane 100 or screen, have these intrinsic uneven surfaces with coherent light 120(its for example by Laser emission) irradiation, so described coherent light is reflected from the form of scattering center 110 with concentric spherical wave 130.The mutual interference of adjacent spherical wave 130 causes: observer's eyes 140 are perceived the zonule with different light intensity degree, so-called Image Speckle, and wherein eyes 140 only have limited diaphragm diameter.
Be created in for example screen of wavefront with out of phase and projecting plane 100(based on the projector equipment of laser) between mutual interference.These are interfered may be because the granularity of screen surface causes spotted light intensity distributions.
By the figure of back, set forth according to the optical element of different embodiment vibration of the present invention and be used for anti-spot method with the head-up display of laser projection device.
Fig. 2 shows the schematic diagram that has according to the vehicle 200 of the display device 210 of the embodiment of the invention.Display device 210 is installed in the vehicle 200, and exists with the form of facing display or head-up display here.Head-up display 210 comprises optical instrument 215, projection screen 220, deflecting mirror 225, display element 230 and opertaing device 235.
In the diagram in Fig. 2, the projection path of virtual image (not being illustrated in Fig. 2) or its data or light path represent by a plurality of dotted arrows 240 with different directions.Therefore, the former figure of virtual image exists with the form of laser-projector from optical instrument 215(here by the dotted line light beam) be projected onto on the projection screen 220.By the surface of projection screen 220, this image is reflected on deflecting mirror or the refrative mirror 225.This deflecting mirror or refrative mirror make the image break-in to display element 230, and this image is last as shown for observer's 245 visible virtual images there.Display element 230 exists with the form of the windshield of vehicle 200 here.Observer 245 is the driver here or usually is the passenger of vehicle 200.Can be found out well by the diagram among Fig. 2, virtual image roughly is presented on the display element 230 in observer 245 eye-level, so that it is on observer 245 the line of vision 250.
For the mottled effect that reduces or avoid because the uneven surface of projection screen 220 (such as it in the above by as described in Fig. 1) to cause, the embodiment shown in Fig. 2 of display device 210 has the device 255 for reducing mottled effect presented here.Among the embodiment shown here, device 255 has be used to two equipment 260 that make projection screen 220 and deflecting mirror 225 motions.Instead, also can only arrange one is used for the device 260 of motion projection screen 220 or a device 260 that is used for motion deflecting mirror 225 only is set.This opertaing device 235 provides pumping signal via circuit 270 to the unshowned actuator in Fig. 2 of equipment 260, described actuator response makes projection screen 220 and deflecting mirror 225 rapidly continuous motion or vibrations in this pumping signal, so that mottled effect is excluded completely or partially.Therefore, observer 245 can observe on display element 230 virtual image without Image Speckle.
Fig. 3 A to 3C is set forth in the different embodiment of the equipment 260 of the device that is used for the minimizing mottled effect shown in Fig. 2 by schematic diagram.Fig. 3 A to 3C shows at the equipment 260 for the enforcement that makes projection screen 220 motions.
Fig. 3 A shows and is being used for first embodiment of motion with the equipment 260 of the enforcement of the projection screen 220 of projection glass form.Equipment 260 comprises carrier element 300 and four electroactive actuators 310 here.Projection screen 220 and carrier element 300 have respectively rectangular shape, and wherein the girth of carrier element 300 is larger, so that actuator 310 can be disposed between the side of carrier element 300 and projection screen 220.This diagram shows the vertical view of equipment 260, also namely sees the inherently uneven projecting plane 100 to projection screen.
Four actuators 310 so are arranged and are fixed on framework or carrier element 300 places, so that the fringe region of their contact projection screens 220.Framework 300 is configured to be carried on by actuator 310 faces employed projection screen 220 in the display.In the embodiment shown in Fig. 3 A, electroactive actuator 310 so is fixed on carrier element 300 places, so that they are equably around projection screen 220 layouts, wherein two actuators 310 are relative respectively.Actuator 310 is assigned to each lateral edges of projection screen 220, wherein actuator 310 respectively in center arrangement at corresponding lateral edges place.Actuator 310 can be placed in the vibration by pumping signal, and described vibration transmission is to projection screen 220, so that it in extremely rapid succession moves back and forth to a certain extent also i.e. vibration.In Fig. 4 of back, also inquire into more accurately the action principle of electroactive actuator 310.
According to the layout of actuator 310 in the situation in the embodiment shown in Fig. 3 A at equipment 260, projection screen 220 flatly, also move in the original plane of projection screen 220 when electroactive actuator 310 vibration.The vibrations of projection screen 220 can be carried out in longitudinal extension direction and/or the horizontal expansion direction of projection screen 220, as by arrow 320 representing in the diagram.
Fig. 3 B shows the replacement embodiment of equipment 260.Shown here equipment 260 has difference corresponding to shown in Fig. 3 A: use 8 electroactive actuators 310 here, wherein for for the purpose of very clear only two Reference numeral 310 is equipped with.These actuators so distribute around projection screen 220, are fixed between the electroactive actuator 310 in the framework 300 by the angle so that the angle of rectangular projection screen 220 is arranged in two.Therefore each lateral edges of projection screen 220 has been assigned with two actuators 310, and wherein two of lateral edges actuators 310 are arranged in respectively corresponding lateral edges place prejudicially.Correspondingly, this embodiment of equipment 260 is except by realizing also the arrow element 320 described oscillating movements that projection screen 220 is orthogonal to rotatablely moving of axis that original plane stretches around projection screen 220 in original plane.Projection screen 220 moves in the diagram in Fig. 3 B by this of whirling vibration and represents by other arrow 330.
Fig. 3 C shows the other embodiment of equipment 260.Here, different from the example of setting forth by Fig. 3 A and 3B, electroactive actuator 310 is under the fringe region of the relative downside of the upside with consisting of the projecting plane of screen 220.Framework 300 is arranged to, so that the downside of screen 220 is crossed over fully.Instead, the downside of framework 300 and screen 220 can be partly overlapping.Between the downside of framework 300 and screen 220, there is the gap.The downside that framework 300 is connected with screen connects by electroactive actuator 310.
According in the layout shown in Fig. 3 C, projection screen 220 tilts by the vibration of electroactive actuator 310 or in the middle movement of rotatablely moving of the axis in the original plane that is placed on projection screen 220.This axis that can in the longitudinal extension of projection screen or horizontal expansion, stretch in the original plane according to the actuator 310 that encourages respectively or alternately or side by side carry out around two axis of rotatablely moving.Represent by two arrows that are directed upwards towards 340 in the diagram of these direction of motion in Fig. 3 C of projection screen 220.Electroactive actuator 310 also can so be controlled, so that projection screen 220 is carried out the linear movement that is orthogonal to original plane.
Fig. 3 D shows another embodiment of equipment 260.As in the embodiment situation as shown in Fig. 3 A, four electroactive actuators 310 are disposed in the respective side of rectangular projection screen 220 and around between its carrier element 300.Such as what can be found out by the diagram in Fig. 3 D, actuator used herein 310 and differently so being bent described in formerly the figure are so that end regions abuts in respectively framework 300 places and relative end regions abuts in projection screen 220 places.At this, the second end that actuator 310 can utilize the first end zone 332 that marks by the first circle in this diagram and carrier element 300 to be fixedly connected with and to utilize to mark by the second circle in this diagram regional 334 is fixedly connected with projection screen 220.Electroactive actuator 310 for example can be by being undertaken by the bonding of bonding agent with being connected of framework 300 or projection screen 220.The position of employed actuator 310 and enforcement allow the whirling vibration of passing through arrow 330 expressions of projection screen 220 in the embodiment situation shown in Fig. 3 D, and is described in conjunction with Fig. 3 B such as it.
Fig. 4 has illustrated the embodiment of electroactive actuator 310 with schematic diagram, such as it being used in the equipment of describing by Fig. 3 A to 3C.Actuator 310 is by the electrically active component 400 of strip and form with the metal platelet of the form of little steel plate 410 here.Electrically active component 400 plane earths are fixedly connected with little steel plate 410 or for example pass through polymer adhesive.Electrically active component 400 can be piezoelectric element.Actuator 310 is connected with opertaing device 235 or control module (opertaing device 235 of the display device of for example introducing in Fig. 2) by electric line 420 via electrically active component 400.In response to electric signal, this electric signal is applied to electrically active component 400 via circuit 420 by opertaing device 235, triggers electrically active component 400 and thus motion or the vibration of actuator 310.
Fig. 5 shows the schematic diagram that reduces mottled effect for setting forth, and is possible such as it according to element and function in front description.As among Fig. 1, show again uneven surperficially 100 inherently here, be the surface of projection screen 220 here.Parallel arrow bundle represents that coherent laser beam 130 incides on the surface 100.Different from the diagram in Fig. 1, here illustrate, owing to describedly different are applied on the screen 220 and make screen 220 place the vibration of motion, the intrinsic unevenness on projecting plane 100 is scattered back the coherent light 130 of institute's projection mussily in all directions, has realized thus anti-mottled effect.
Fig. 6 A to 6C has correspondingly set forth different embodiment at the equipment 260 of the device that be used for to reduce mottled effect shown in Fig. 2 by other schematic diagram.Fig. 6 A to 6C shows the equipment 260 in the enforcement that is used for motion refrative mirror 225.
According to these embodiment, actuator can be additionally or instead is placed on refrative mirror 225 places at the head-up display shown in Fig. 1.Also can produce anti-mottled effect in this way, wherein only consider vertically mobile and rotating mirror 225 here.
Fig. 6 A shows for the diagram of setting forth the action principle of this equipment 260 when equipment 260 is used to make refrative mirror or deflecting mirror 225 motion.Diagram in Fig. 6 A has following difference corresponding to the diagram of Fig. 3 C: carrier element 300 is configured to replace projection screen carrying deflecting mirror 225 except actuator 310 here.Deflecting mirror 225 is implemented as rectangle equally, and wherein its size is roughly corresponding to the size that is in the framework 300 under it.This diagram in Fig. 6 A shows the mid point 600 of deflecting mirror 225 in addition, and it represents by the arrow that is directed upwards towards.Line by mid point 600 represents to be in the longitudinal extending axis 610 in the original plane of deflecting mirror and is in horizontal expansion axis 620 in the original plane of deflecting mirror, can be according to the embodiment rotating and excursion mirror of next setting forth, in order to reduce mottled effect around it.At this, angle 630 expression deflecting mirrors 225 are around the rotation of longitudinal extending axis 610, and angle 640 expression deflecting mirrors 225 are around the rotation of horizontal expansion axis 620.
By unique actuator 310 being fixed on the long side of refrative mirror 225 or the edge of short side, wherein long side may be oriented side level and short and may be oriented vertical in the installment state of refrative mirror 225, can obtain the rotation of refrative mirror 225, the same deviation that produces the image of reflection of this rotation, this deviation the observed person discover as smoothed image.
Correspondingly, Fig. 6 B and 6C show the embodiment of equipment 260, and it causes the rotation of deflecting mirror 225.In two figure, diagram corresponds essentially to the diagram of Fig. 6 A, has following difference: only use respectively an actuator 310.
Fig. 7 illustrates for setting forth by schematic diagram and is used for the layout of the ultimate principle of another embodiment of the head-up display 210 of suggestion here.Here show the several most important element for generation of the virtual image of being discovered by the observer of facing display or head-up display 210 of advising here, the surface of namely using with the optical instrument 215 of laser projection device form, as projection screen 220 and as the deflecting mirror 225 of one of possible different optical element.A plurality of line beams between each element represent virtual image from its initial point until the path of final expression, as it is set forth more accurately by Fig. 2.Produce at last the surface of virtual image (not shown in Fig. 7) thereon or can be windshield or can be transparent material as combiner.In addition, this diagram in Fig. 7 shows sensor 700, and this sensor is arranged for the data that detect at the image of refrative mirror 225 reflections here.
Fig. 7 shows the part of the embodiment of simple HUD 210, wherein has the optical instrument, projection screen 220 of laser instrument or laser-projector 215 and is used as most important element as the refrative mirror 225 of unique deflecting mirror.Here, only observe in more detail head-up display 210, for the relevant opticator of projection screen 220.
Fig. 8 illustrates the embodiment for the process flow diagram of the method 800 that reduces the mottled effect of image on the display element of display device, and this display device comprises be used to projecting image onto the optical instrument on the projection screen and being used for the deflecting mirror of image from projection screen to display element deflection.
The anti-spot method that is used for laser projection system 800 for example can be implemented by the display device of setting forth by Fig. 7.In first step 810, detect the contrast value of the former figure of the virtual image that will show at display element at the projection screen of display device and/or deflecting mirror.This image for example can detect by the sensor of display device.In second step, send the contrast value that detects the opertaing device of display device to and analyze there by sensor.In third step 830, opertaing device based on the contrast value analysis to the equipment that is used for making projection screen and/or deflecting mirror motion should or these actuator output drive signals.In the step 840 of following, actuator is implemented vibration based on voltage and/or the frequency of pumping signal, makes projection screen and/or deflecting mirror motion by means of this vibration.Therefore, can using method 800 determine measured frequency and the voltage of pumping signal according to the contrast value of former figure, in order to suppress best the final mottled effect of virtual image on the display element of display device.
Here the invention scheme of suggestion relates to projection screen and/or refrative mirror and describes motion or the vibration of this screen and refrative mirror, and these motions or vibration are produced by actuator, so that cancellation or reduce the mottled effect that is produced by laser projection system.
Embodiment described and shown in the figure only exemplarily selects.Different embodiment can fully or about each feature ground make up mutually.An embodiment also can replenish by the feature of another embodiment.The inventive method step can repeat and implement to be different from described order in addition.If embodiment be included between First Characteristic and the Second Characteristic " and/or " logic connects, then this readablely is: this embodiment has First Characteristic and Second Characteristic according to an embodiment, and according to another embodiment or only have First Characteristic or only have Second Characteristic.
Claims (10)
1. be used for reducing the method (800) of the mottled effect of image on the display element (230) of display device (210), this display device comprises that wherein the method has following step be used to projecting image onto the optical instrument (215) on the projection screen (220) and being used for the deflecting mirror (225) of image from projection screen to display element deflection:
Make projection screen and/or deflecting mirror at least one direction motion (840), in order to reduce mottled effect.
2. method according to claim 1 (800), wherein, in motion (840) step with projection screen (220) about the original plane of projection screen in this original plane mobile and/or with this original plane orthogonally mobile and/or axis rotation in being in original plane and/or with deflecting mirror (225) about the original plane of deflecting mirror and original plane orthogonally axis (610,620) mobile and/or in being in original plane rotate.
3. according to the described method of one of the claims (800), the method also has the step (830) of pumping signal being exported at least one electroactive actuator (310), and this electroactive actuator is configured to carry out motion (840) step in response to pumping signal.
4. be used for reducing the device (255) of the mottled effect of image on the display element (230) of display device (210), this display device comprises that wherein this device has following feature be used to projecting image onto the optical instrument (215) on the projection screen (220) and being used for the deflecting mirror (225) of image from projection screen to display element deflection:
Be used for making projection screen and/or deflecting mirror to move in order to reduce the equipment (260) of mottled effect at least one direction.
5. device according to claim 4 (255), wherein, be used for making the equipment (260) of projection screen (220) and/or deflecting mirror (225) motion to have at least one first electroactive actuator (310), it is configured to carry out vibration in response to the first pumping signal, so that motion projection screen and/or have at least one second electroactive actuator (310), it is configured to carry out vibration in response to the second pumping signal, so that the motion deflecting mirror.
6. device according to claim 5 (255), wherein, the first electroactive actuator (310) and/or the second electroactive actuator (310) comprise piezoelectric element (400).
7. according to claim 5 or 6 described devices (255), wherein, be used for making the equipment (260) of projection screen (220) and/or deflecting mirror (225) motion also to have the first carrier element (300), wherein this first electroactive actuator (310) is disposed between projection screen and the first carrier element, in order to projection screen be connected with the first carrier element and/or have in addition a Second support element (300), wherein this second electroactive actuator is disposed between deflecting mirror and the Second support element, in order to deflecting mirror is connected with the Second support element.
8. according to claim 4 to one of 7 described devices (255), have for detection of the image on projection screen (220) and/or deflecting mirror (225) and output based on the sensor (700) of the picture signal of this image and have for control is used for making the opertaing device (235) of the equipment (260) of projection screen and/or deflecting mirror motion based on picture signal.
9. be used for reducing the opertaing device (235) of the mottled effect of image on the display element (230) of display device (210), this display device comprises that wherein this opertaing device has following feature be used to projecting image onto the optical instrument (215) on the projection screen (220) and being used for the deflecting mirror (225) of image from projection screen to display element deflection:
Be used for receiving the input interface of picture signal, wherein picture signal is provided by the sensor (700) for detection of the image on projection screen and/or deflecting mirror;
Be used for to determine based on the pumping signal of picture signal locking equipment really; With
Be used for the output interface at least one electroactive actuator (310) output drive signal, this electroactive actuator is configured to make projection screen and/or deflecting mirror motion in response to pumping signal.
10. the computer program that has program code, described program code are used for implementing according to claim 1 method (800) to one of 3 when program when being performed at opertaing device (235).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102011084530A DE102011084530A1 (en) | 2011-10-14 | 2011-10-14 | Method of reducing speckle effect of image displayed on display element of display device, involves moving a projection screen or a deflecting mirror of display device, in at least one direction, to reduce the speckle effect of image |
| DE102011084530.5 | 2011-10-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103048799A true CN103048799A (en) | 2013-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012103856838A Pending CN103048799A (en) | 2011-10-14 | 2012-10-12 | Method, apparatus and control device for reducing speckle effects on display elements of display apparatus |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN103048799A (en) |
| DE (1) | DE102011084530A1 (en) |
| FR (1) | FR2981464B1 (en) |
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| CN103246078A (en) * | 2013-04-23 | 2013-08-14 | 夏云 | Follow-up distributed perturbation screen secondary speckle eliminating device |
| CN104142602A (en) * | 2013-05-09 | 2014-11-12 | 图象公司 | Methods and systems of vibrating a screen |
| CN105807546A (en) * | 2015-01-21 | 2016-07-27 | 罗伯特·博世有限公司 | Projection screen apparatus, projection apparatus, and projection method |
| CN107257939A (en) * | 2014-09-08 | 2017-10-17 | 瑞尔D股份有限公司 | Screen for reducing speckle vibrates |
| CN109388016A (en) * | 2017-08-02 | 2019-02-26 | 杜尔利塔斯有限公司 | Holographic projector |
| US10691006B2 (en) | 2014-12-09 | 2020-06-23 | Imax Theatres International Limited | Methods and systems of vibrating a screen |
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| DE102013008372A1 (en) * | 2013-05-16 | 2014-11-20 | GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) | Method and device for reducing speckles of an image of an object generated in a reproduction device |
| DE102013218061A1 (en) | 2013-09-10 | 2015-03-12 | Robert Bosch Gmbh | Apparatus and method for reducing light granulation of an image on a display element of a display device |
| DE102013218099B4 (en) * | 2013-09-10 | 2022-09-01 | Continental Automotive Technologies GmbH | Process for a head-up display |
| JP7173895B2 (en) | 2019-02-22 | 2022-11-16 | 日立チャネルソリューションズ株式会社 | Aerial image display device, transaction device, and aerial image formation control method in aerial image display device |
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Also Published As
| Publication number | Publication date |
|---|---|
| FR2981464A1 (en) | 2013-04-19 |
| FR2981464B1 (en) | 2019-06-28 |
| DE102011084530A1 (en) | 2013-04-18 |
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